As previously posted:
Looks like one of two problems:
1. Mag springs weak or follower of poor design; or
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You should be changing your mag springs and followers every year. Granted, you might be able to run one spring 10 years before it loses strength, but then you're only catching the other springs
after they fail.
The only one I missed was mentioned by Tailgate -- light loads. I once tried WinClean .45 ACP and only later learned that it is notorious for being lightly loaded. I had a ton of goofy malfunctions with my 18 pound spring on my 5". My friend's Kimber with it's 16 pound spring was fine, although I think he also installed an 18 pound spring at some point.
If your gun was fine til recently, seems that the mag springs have gotten weak and are not getting that last round up there quick enough and the slide is missing the rim. The toughest rounds for a magazine to feed are the first (too much spring tension against the feed lips) and the last (too little spring tension at the end of the springs cycle).
But definitely do the mag springs first and only make one change at a time (i.e., leave the current recoil spring in there).
Let us know what happens.
EDITED to say that the only thing that I disagree with in Tailgate's post is this:
Have you kept your magazines loaded with ammo while stored?
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I think that mag springs wear out by being cycled and that a properly designed magazine can be stored loaded.